- Wayne Grudem
In this audio segment, John Piper decries a "pea shooter Sunday school knowledge of God" as an effective tool for fighting porn temptation. His solution? Read Wayne Grudem's Systematic Theology, cover to cover.
If you don't own a copy of Grudem's book, go get one. In my mind it's the most accessible, readable, and practical systematic theology on the market. In just a few short years it's become a classic evangelical work on the totality of biblical doctrine.
For what it's worth, I love Piper's advice. To know more and greater truth about God is to know His glory. To know His glory is to know Him. To know Him is to know satisfaction. And satisfied people don't bother with "mud pies in a slum."